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Published in Scientific Papers. Series B, Horticulture, Volume LIX
Written by Dimka HAYTOVA, Nikolina SCHOPOVA

The application of foliar sprays is an important crop management strategy, which may help maximizing crop yield andquality. The influence of different agricultural practices, such as foliar application on generative expressions ofzucchinis is slightly studied. The objective of our research was to assess the influence of some foliar fertilizerstreatments on sexual expression of zucchini squash. The experiments were carried out during the period 2007-2009, onExperimental field of Department of Horticulture at the Agricultural University of Plovdiv, Bulgaria. Variety 'IzobilnaF1’ was used as an object of the experiments. The field experiments were done by randomized block design with fourreplications. Complex foliar fertilizers Fitona 3, Hortigrow and Humustimin in three concentrations, separately and inbackground on soil fertilization N16P16K16 were used. The number of male and female flowers per plant, proportionmale:female flowers, number of fruits per plant and percentage of fructification were determinate. The results of thisexperiment indicate that optimal mineral nutrition and providing additional nutrients through foliar application duringthe period of intensive growth and fruiting influenced positively on the number of fruit formation and increase thepercentage of fruit development. The highest number of fruits and the highest percentage of fruit formation isoutstanding the variant N16P16K16+0.3% Humustim, followed by N16P16K16 + 0.2% Hortigrow and by N16P16K16 + 0.3%Hortigrow.

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